function [IA_Relation] = IA_Relation_Number(k)
%IA_Relation_Number Summary of this function goes here
%   Detailed explanation goes here
  switch(k)
    case 1 
      IA_Relation = IA_Relation_Less();
    case 2
      IA_Relation = IA_Relation_During();
    case 3
      IA_Relation = IA_Relation_Overlaps();
    case 4
      IA_Relation = IA_Relation_Meets();
    case 5
      IA_Relation = IA_Relation_Starts();
    case 6
      IA_Relation = IA_Relation_Finishes();
    case {7, 14}
      IA_Relation = IA_Relation_Equals();
    case 8
      IA_Relation = IA_Relation_Greater();
    case 9
      IA_Relation = IA_Relation_Contains();
    case 10
      IA_Relation = IA_Relation_Overlapped();
    case 11
      IA_Relation = IA_Relation_Met();
    case 12
      IA_Relation = IA_Relation_Started();
    case 13
      IA_Relation = IA_Relation_Finished();
    otherwise
      IA_Relation = IA_Relation_Null();
  end
end